Inspection gauge



Jan. 22, 1946. `H. T. HALLowEL-L, .JR 2,393,246

V y INSPECTION GAUGE I Filled Jan. 25, 1945 4 Shee'LS-Sheet l `lem. 22, 1946.

INSPECTION GAUGE `H. T. HALLOWELL, JR

Filed Jan. 25, 1945,

Jan. 22, 1946. H. TK. HALLQWELL. .JR v 2,393,246

' Y INSPEQTION GAUGE' Filed Jan'. 25, 1943 v 4 Sheets-Sheet 4 frm/2%@ ji W 4/ @WWW 'Patented Jan. 22, 1946 INSPECTION GAUGE Howard Thomas Hallowell, Jr., Jenkintown, Pa.,

assignor to Pennsylvania Manufacturing Company, Jenkintown, Pa., a corporation ofDela- Application January 23, 1943, Serial No. 473,382

9 Claims.

This `invention relates to inspection gauges Vfor use `primarily with the assembling machine disclosed in my pending application Serial Number 424,052. The gauge of the present invention Ywhile adapted primarily for inspection of priming head assemblies of the type disclosed in the aforesaid application, will be found useful for inspection of other articles or products, and the invention, therefore, is not limited to the particular use herein described.

A principal object of the invention is to provide a gauge which shall be capable of extremely rapid and accurate operation in gauging one or a plurality of vital dimensions in the article under inspection.

More specically, an object of the invention is to provide a gaugethat will function in a single operation to test a plurality of vital dimensions in a given article under inspection.

Another and still more specific object of the invention is to provide an inspection gauge that will function in a single operation to gauge the several vital dimensions of a priming head assembly of the type herein disclosed.

A further object of the invention is to provide in combination with said gauge a means for automatically segregating those of the articles which pass inspection from those others which are rejected as being deiicient in one or more of the vital dimensions.

The invention further resides in certain structural and mechanical details hereinafter described and illustrated in the attached drawings,

in which:

Figure l is an end elevational view of an inspection gauge made in accordance with my invention;

Fig. 2 is a section on the line 2-2, Fig. 1;

Fig. 3 is a top plan view of the gauge;

Fig. 4 is a section on the line 4-4, Fig. l;

Fig. 5 is a fragmentary sectional view corresponding to the sectional View of Fig, '4 and illustrating a detail of operation;

Fig. 6 is an enlarged fragmentary sectional view corresponding to Fig. 4 and illustrating another phase of the operation;

Fig, 7 is a section on the line 1-1, Fig. 3;

Fig. 8 is a View in perspective of the relatively xed body of the gauge detached from the gauge mechanism;

Fig. 9 is a view in perspective of one of the elements of the mechanism appearing at the lower end of Figs. 1,2 and 4;

Fig. 10 is a diagrammatic elevational view illustrating the gauge in its application to an aS.-

semblingmachine of the type shown in my aforesaid pending application Serial Number 424,052; Fig. 11 is an exploded view of three of the separate elements of a priming head assembly;

Fig. 12 is a vertical sectional view of said assembly Fig. 13 is a diagrammatic view illustrating the details of the electrical control mechanism' Fig. 14 is a sectional view of one of the'micro switches employed in the device, and

Fig. 15 is a View in perspective showing two elements of the micro switch mechanism detached from the switch assembly.

With reference to the drawings, the gauge as therein. illustrated comprises a body or frame member I, see Figs. l, 2 and 8, which `for-ms a relatively Xed support for the operating elements of the gauge. In one side of the frame I is a recess 2, into which projects the peripheral portion of a rotary work-table 3 which carries the work elements. In the present instance Ithis table 3 is an element of the assembly mechanism disclosed in my aforesaid pending application Serial Number 424,052, said machine being adapted to assemble the percussion element 4, the firing pin 5, and the retaining cap 6 in the casing 1 of a priming head for explosive shells. 'Ihe elements Il,v 5 and 6 and the assembled head are shown in Figs. 11 and 12. Y

As shown in Figs. 4 and 6, the Work-table 3 is provided in its peripheral portion with a circ-umferential series oef vertical .fbores 8 which constitute sockets for reception of the casings 1 of the respective priming heads. As the Work-table rotates, the elements 4, 5 and B are assembled in the casing 1 in the manner set forth in my aforesaid pending application, said assembling mechanism comprisingin part a plunger 9 which is supported sin a verticallyreciprocatory member I I, these parts being actuated from a crank shaft I2 which is connected by means (not shown) with the prime mover of the assembling machine. Means is also provided in the form of `a'lever I3, a cross head I4 and a pawl .I5 pivotally mounted on said cross head for intermittently rotating and properly indexing the Work-table 3, said pawl coacting in the present instance with a circumferential series of pins I6 on the under side of the table. The lever I3 is operatively connected to and receives its motion from the shaft I2.

As illustrated in Fig. 10, the inspection gauge is arranged in position to operate upon the com` pleted priming head assemblies, and said gauge incorporates and operates in conjunction with an ejecting device which removes the priming head assemblies from the work-table after inspection and segregates the defective assemblies from those which meet the test requirements. It is to noted further 4by reference to Fig. l0 that the gauge and ejector mechanisms are operated from the shaft I2 through an intervening transmission which comprises a gear I1 on'the said shaft,V an intermeshing gear I8', bevel gears I3 and 2-I, a shaft 22, =bevel gears 23 and 24, a cam 25 operatively associated with the last-named bevel gear, and a pivotally mounted lever 2S, one end of which engages the cam and the other end of which is connected through a ilexible cable 21 with the gauge mechanism. The device -as a whole further includes a timing mechanism shown in Fig. l0, ythe function of which will be hereinafter described, and it is to be noted that this mechanism also is operatively connected through gears 28 and 29 with the shaft 22, and through the latter with the crank shaft I2. y

' As the priming head assemblies are brought into the inspection position by the indexing means previously described, the cam acts through the leverV 26 and cable 21Vto permit the active elements of the gauge to move into operative posiytionpwith respect to the aligned priming head as. sembly. These elements comprise a plunger 3I which engages the top surface ofthe priming head; a sleeve 32 embracing the plunger 3i which is adapted to seat against the upper surface 33 of the table 3,'upon which also seats the terminal ilange 34 of the priming head; a plunger 35 which Vextends downwardly through the open top of the cap E and engages the exposed upper u the priming 'head and thesupporting table 3 is i clearly illustrated in Fig. 6.

As shown in Fig. 4, the `upper end of the plunger 3l is rigidly connected in a head 38which moves with the plunger. The head 38, seeFig. 1,'has a pin 39 projecting fromv each'side thereof, and

'thse' pinsiorm'anchors Afor theupper ends of a pair of coiled springs 4I, 4I', the'lower ends of which. are connected to corresponding pins 42 on the Vframe I. The springs exert a continuous ten# sion tending to draw the head 38 and the plunger 3I` downwardly toward and in the frame. Elevation ofthe plunger 3l and head 38`in the frame is effected solely through a lever 43 which is pivotally connected at'44 to the frameV I, and which is formed at its inner end with a segmental gear 45 which meshes with a rac1 i4i6 on the plungerv'3 I. It is to be noted that' the sleeve 32 is apertured to provide for passagetherethrou'gh ofthe lever 43, The'outer end oi the lever 43, which is fbifurcated, as shown'inV Fig. l, extends into the path of a 'collar '41 on a rod' 43, the upper end of which rod passes slidably throughs. bore 49' in the' head 38 andthe' lower end of which is secured to a member 5I', this member being.' rigidly connected 'to the lower e'nd of the plunger`33, 'see' Figs'. 1, 2, 4 and 9. The member 5I'is also connected' to the lower end'of an 'ejector plunger 52 which isv slidably supported in a bore 53'in thefrarne I', This bore parallels and lies adjacent to the bore 54 which constitutes the guide for the Vplunger 36, The

plunger 52 extends below the member 5 I, see Fig. 2, and has provision for attaching thereto the end of the flexible connector 21. When the cam acts through the levei` 2S to draw the member 5I downwardly, the collar 41 engages the outer end of the lever 43 and thereby elevates the plunger 3 I, see Fig. 5, and the head 38. Thus, the upward movement of the plunger 3I is accompanied necessarily by a downward retraction of the plunger 35.

Mounted on the head 38 are four micro switches of the character illustrated in detail in Fig. 14. lIhese switches are designated respectively by the reference numerals 55, 56, 51 and 58. At the center of the-head 38 is an upstanding, pedestal element 59. Projecting from opposite sides of this element are pins 6I and 62 which form pivotal supports respectively for a pair of switch-actuating levers 63 and y64. The lever B3 extends at the` opposite sides of the pivot, and its opposite ends overlie the control buttons and 66 respectively of the switches 51 and 58. In each end. of the lever is a set screw 51 which respectively overlie and engage the buttons 65 and 66, these set screws affording adjustability between the lever 53 and the buttons B5 and 66. The lever 64 is similarly operatively associated with the control buttons 68 and G9 of the switches 51 and 58, this lever 64 also carrying the adjustable set screws 61 for engagement of the switch buttons. Supported at the top of the pedestal 59 is a leaf spring 1I, the opposite ends 12 and 13 of this Vspring exerting resilient pressure upon the upper surface of the levers l63 and 64 respectively, see Fig. 3, it being noted'that each of the levers has a transverse projection 14 which provides a seat for the spring endv Inthe present instance, the spring is held in place at the top of the pedestal 59 by means of a retaining screw 15.

Referring more particularly to Fig'. 4, it will be noted that the rod 48 lies in alignment with the projection 14 of the lever 64, and that a rod 1S extending from the upper end of the sleeve 32 through a bore in the head 38`is similarly aligned with the projection 14 of the lever 63. Each of these projections carries a set screw 11, and these screws are arranged to seat upon the upper ends of the rods 48 and 16 respectively, the spring 1I tending to maintain the levers in the seated relation. Normally the rods 48 and 16 occupy a position in which the levers are supported .in a

vneutral position with respect to the several switches 55, 53, 51 and 58. In this neutral position,Y the levers 63 and 34 while contacting the switch buttons65, 66, 68 and 39 do not exert sucient pressure upon any one of the buttons to displace it downward' from the normal elevated position wherein the respective switches are, in this case, open. Under conditions hereinafter described, the levers 53 and 64 will exert pressure upon one or more of the switch buttons, causing a downward displacement thereof and a resulting closing of the switch.

In Fig. 14 illustrating one of the said switches, the switch button S5 is shown in the normal elevated position, and in this position the terminal elements 18 and 19 'of the switch are separated, the switch being open. With reference also to Fig. 15, il; will be noted that the switch comprises a rigid base element 8l which is secured in fixed position in the casing 82, and a resilient element 83 which is connected to the element 3| and which carries the contact element 19. The contact element 13 is mounted in fixed position in the casing 82. A central arm 84 of the element 83 is secured by a screw 35 to the element 8l and the extremity of each of the shorter arms 86 is seated in a notch 81 in the side of the element 8l, the arrangement being such that the arms 85, 86 are flexed or tensioned, as shown in Fig. 14. The arrangement is such that the outer free end of the element 83 is normally held in the elevated position, as shown in Fig. 14,H but a very slight downward displacement of the button 65, the inner end of which seats upon the central arm'84 of the element 83, causes the outer end of the latter to move downwardly with la snap action so that the contact element 19 .is

brought into engagement with the contact 18 to close the circuit. When pressure is released from the button 65, the resilient element 83 will automatically snap back to its normal elevated position. It will be noted that the inner end of the button 65 has an enlarged head 88 which, when the button has been moved inwardlly suiiiciently to actuate the switch element 83 as described,

lcomes in contact with the side portions of the rigid element 8l, this element thereby constituting a stop to limit the inward movement of the switch button.

It will be noted by reference to Fig. 4 that a coiled spring 89 embracing the plunger 3l is conned between the under side of the head 38 and the top of the sleeve 32; and that the rod 'I3 carries a collar 9| at. the top of the head 38, which by engagement with the upper surface of the' head limits the separation of the head and the sleeve 32 under action of the spring 89. With this arrangement, if the plunger 3l is elevated and with it the head 38, the sleeve 32 will remain stationary only until the head has moved to an extent bringing it into engagement with the collar 9|, after which the sleeve 32 will move upwardly with the plunger 3l as a unit.

'Ihe plunger 35 carries at its upper end an arm Y 92, and projecting from one side of this arm is a pin 93 to which is secured one end of a` coiled spring 94, the other end of the spring being connected through a pin 95 with the head 38. This spring thereby exerts pressure tending to draw the plunger 35 downwardly with respect to the head 38. The set screw in the lever 54 which engages the switch button 69 of the switch 58 is in the form of a cup, as shown at 93 in Fig. 7, this cup having an aperture 9'! in the bottom in alignment with the top of the button S9. Threaded into the outer end of the arm 92is an adjustable pin 93 which extends downwardly through the cup 95 and into the aperture 91, and when the plunger 35 is in a normal position, as shown in Fig. 4, the lower end of the pin 98 contactsthe top of the button 69.

Insofar as described, the operation of the device is as follows: When the table 3 is being advanced and indexed as described above, the plungers 3l, 35 and 3'5 and the sleeve, 32 are retracted, as shown in Fig. 5, this retraction being effected by actuation of the cam which operates in synchronism with the work-table 3 and the other parts of the mechanism. Retraction of the plunger to the elevated position is effected by reason of the contact of the pin 38 with the abutment 69 of the switch 58, it being noted that the construction of the switch as described and as shown in Fig. 14 will permit the switch mechanism to support the weight of the plunger 35 and the pressure exerted through the spring 9a. When the advance movement of the table 3 is interrupted, one of the assembled priming heads supported on the table will be in alignment with the lingers of the inspection device, and these ngers will now be permitted by the cam 25 under action of a spring `99 associated with the ejector plunger 52, as shown in Fig. 2, to advance into the relative positions with respect to the work piece as shown in Fig. 6 of the drawings. If the several dimensions of the priming head are correct, the moving YIf any one of the vital dimensions of the priming head is off in excess of the permitted tolerances, one or other of the micromatic switches 55, 5E, 5l and 58 will be actuated, with the results hereinafter described. More specifically and with reference particularly to Figs. 4 and 6, if the height or thickness of the flange 34 is greater or less than the normal required thickness, this departure from the normal will be reflected'in a correspondingly abnormal relative displacement of the plunger 3l and the head 38 with respect to the sleeve 32. This relative displacement will have the effect either of actuating the switch 56 in the event that the flange is too thick, or the switch in the event that the flange is too thin. In this action, it is to be noted that the sleeve 32 and the rod i6 which is carried by this sleeve and which normally supports the lever 63 in the neutral position as described, maintains an establishedl position by reason of the engagement of Vthe sleeve 32 with the table 3, and these parts thereby provide a xed datum from which the thickness of the flange 33 may be measured. If the flange is too thick, the head 38 will be correspondingly elevated from the normal position through the plunger 3l, and this elevation of the head 38 will tend to lift the lever 63 off of the supporting rod T6 on the sleeve 32. The spring ll, however, will tend to move the right hand end of the lever S3, as viewed in Fig. 2 for example, downwardly to thereby maintain Contact with the supporting other hand the flange :is too thin, the opposite effect is obtained, in that in that case the head 38 will have moved downwardly to a position below its normal, and this downward movement of the head will result through the rod 'l5 in an oscillation of the lever B3 in a counterclockwise direction, as viewed in Fig. 2, with the further result that the button of the switch 55 will be depressed and the switch thereby actuated.

Inspection of the overall dimension of the priming head is similarly effected by the plunger 3l and the plunger 36. If the thickness of the ange 34 is correct, then these parts act in effect to check the axial length of the casing 'l of the priming head from the under side or the flange 34 to the -lower end of the head. If the length of 'this part is too great, the plunger 3S will be depressed from its normal position, with the result that the rod 48 which would otherwise support the switch lever 6l! in a neutral position no longer provides that support, and will permit the spring 'H to move the left-hand end of the lever Gil, as viewed in Fig. 4, downwardly from the neutral position, thereby depressing the button 68 of the switch 5'! and actuating that switch. If the aforesaid longitudinal dimension of thecasimgr l is too small, the opposite occurs, in that the plunger 35 and the rod 48 will now occupy a position slightly above the normal, thereby oscillating the lever Eli from the neutral position and in a clocklwise direction as viewed in Fig. 4, with resulting depression of the button 68 of the switch 58 and actuation'of that switch.

The device aiso functions through the plunger 35 to inspect the position of the ring pin 5 in the assembly. Normally the pin will occupy the position shown in broken lines in Fig. 6, wherein the teat. |0| on the under side of the firing pin bears against the percussion element 4. The upper flat surface of the firing pin 5 under these circumstances will occupy a predetermined position below the upper surface of the casing 1. If the ringpin 5 is in the normal position in the assembly and assuming that the iiange 34 has the required thickness, then the head 38 and the plunger 35 will occupy relative positions bringing the lower end of the pin 9,8 into touching contact with the button 69 of the switch 58. If the posi- Vtion of the ring pin 5 is too low in the assembly,

as will occur if the position of the pin in the assembly is reversed, then the plunger 35 will occupy va position Ibelow the normal one, it Ebeing noted that the lower end of the plunger 35 is provided .with a recess |02, see Fig. 6, which would then receive the teat |01 and permit the bottom surface of the plunger to engage the surface of the body portion of the ring pin around the teat. This depressed positionof the plunger 35 through action of the spring 94 brings pressure to bear through the pin 98 upon the button 69 of Vthe switch 58, thereby to actuate the latter. Either one of two different defective dimensions in the assembled priming head will thereby result in an actuation of the switch 58.

The switches 55, 56, 51 and 58 form elements,

of an electrical lsystem shown in Fig, 13,` which system includes va solenoid |03. The plunger |04 of this solenoid is connected through a link |05 with an arm I 00, and this arm is secured to a vertical rock shaft |01 journaled on the frame I, as best shown in Fig.. 2. A coiled spring |08 is supported on the shaft |01, one end of the spring being secured to the frame I and the other to the arm |06 whereby the spring tends to retain the arm |00 in a position shown in Fig. 3, wherein the plunger |04 of the solenoid |03 is extended. Secured to the lower end of the shaft |01 is a hood-like deector |09, the inner end of which overlies the path of the priming head assemblies on the work-table 3, while the other end of the hood overlies the mouth of a chute I I. A second chute I I2 immediately adjoins the chute III, and when the solenoid |03 is energized, the resulting movement of the plunger and of the arm |06 oscillates the deflector |09 around the axis of the shaft |01, so that the outer end thereof overlies the mouth of .the chute |I2, as shown in broken lines in Fig. 3. The inner end of the deflector, see Figs. l and 3, directly overlies that one of the series of priming head assemblies on the work-table 3 which immediately adjoins the inspection position, so that after any gauging operation has been completed, the next advance movement of the table 3gwill carry the inspected priming head into a position under the inner end of the deflector. Also the ejector plunger 52 occupies a position directly under the inner end of the deiiector |09, so that when any one of the priming heads has been moved with the table 3 to a position under the deflector, it is also in direct alignment with the ejector 52. When the ejector is moved upwardly by action ofthe spring 99, the aligned priming head will be ejected from its socket in the table 3 upwardly into the deflector which is shaped so as to deect the ejected head outwardly, as shown in Fig. 2 and downwardly into the mouth o the chute III or the chute II2, depending on the angular position of the deiiector with respect to the axis of the shaft |01.

It is to be noted that at the same time the ejector 52 moves upwardly inthe ejection operation, the plungers 3|, 35 and 36 and the sleeve 32 of the inspection device are moving into operative engagement with the adjoining and irrimediately following one of the priming heads in the table. The upward movement of the ejector 52 is terminated by the engagement of .the plunger 36 with the under side of the priming head undergoing inspection. It is to be noted further that the plunger 3| will have moved into engagement with theV upper surface of the said priming head before the plunger 38 engages the under side, so that the priming head will be held solidly in its socket against the action of the plunger 36 which is brought sharply into engagement with the under side of the priming head by action of the spring 99.

The function of the electrical system shown in Fig. 13 is to provide a delayed action ofthe solenoid |03 such that when one 'of the priming heads in the gauging position has been inspected, the necessary provision will be made for actuation of the solenoid |03 to insure the subsequent discharge of that particular priming head in the next cycle of operations into the proper one of the pins III and |I2. To this end, the electrical system comprises a circuit which includes a camactuated switch H3, the several switches 55, 56, 51 and 58, which are arranged in parallel, and a cam-actuated two-way switch H4. When the switch H is in one of its positions, see Fig. 13, the circuit extends through a coil I I5 (of a, magnet or solenoid, not shown), and a cam-actuated switch H6. When the switch |I4 is in the other position of adjustment, it completes the circuit through the coil ||1 (of a second magnet or solenoid, not shown) and a cam-actuated switch I.

The coil I| 5 constitutes the actuating element of a compound switch I I9 containing two sets of terminals, |2`I and |22 respectively. When the coil is energized, a holding circuit for the coil II5 is completed, said circuit including the two terminals IZI. The terminals |22, which are also connected together when the coil is energized, as shown in Fig. 13, are in another circuit which is controlled by a two-way cam-actuated switch |23. Thus when the terminals |22 are electrically connected by energization of the coil II5, one of the fixed terminals |26 of the switch |23 is energized, and if the movable element |25 of the switch |23 is moved into contact with the element |24, then the circuit of the solenoid |03 is completed and this solenoid energized with resultant adjustment of the deflector |09.

As previously set forth, the coil II'I is associated with a corresponding compound switch |26. Two of the terminals |21 of this switch, when connected by actuation of the switch |20, complete a holding circuit for the coil ||1. The other two terminals |28 are established in a circuit which isA controlled also by the two-way switch |23 which contains the solenoid '|03. When the terminals |28 areelectricallyA connect'- ed, as by energizaton of the coil I I1, the termina-l element |29 of the switch I 23 is energized, and if the movable terminal |25 is then in the position in which it is shown in Fig. 13, the circuit which contains the solenoid I 03 will be completed and this solenoid energized, with the result that the guide member |09 is oscillated from its' normal position over the chute 1 I I to a position over the chute |12.

The cams 13|, 132, |33, |34 and |35 are mounted in the present instance upon a common shaft |315,Y see Fig. 10, which is operatively connected through the gears 28 and 29 with the shaft 22, andwhich, therefore, operates in synchronism with the other elements of the mechanism, The cam 13| has two projections 13'1 and |38 which areY arranged to close the switch |13 when the elements of the inspection mechanism are in the active inspecting position with respect to the work piece, as shown in Fig. 4, the projections |31 and |38 of the cam alternating in this function and closing the switch |13 for successive inspection operations. The cam 132 is formed so as to shift the switch |111 after approximately each 180 of revolution so as to alternately and successively open and close the circuits which contain the coils 115 and |11 respectively.- In Fig. 13, it will be noted that the projection |31 is in position to close the switch |13 and the switch |14 has just been moved by the cam |32 to a position completing the circuit of the coil 115. The switch 1 13 is only momentarily closed, and will be closed again when the cam 13| has moved through 180 of rotation so as to bring the projection 138 into the position now occupied. by the projection 13'1. A corresponding 180 movement of the cam 132, however, will result in the dropping of the movable element of the switch arm 11d in-to a position'closing the circuit of the coil 11T, so that when the projection 138 of the cam |31 momentarily closes the switch 113, the switch 114 will be in a position to open the circuit of the coil 15 and close the circuit of the coil The cam 133 is formed so as to retain the switch |16 closed during 180 of rotation of the cam and to releasev the switch to the open position during the other 180 of angular movement. As shown in Fig.13, the switch |16 is closed, and will remain closed during the next 180 of rotation of the -cam |33. It is now apparent that with the several switches |13, 114 and |16 in the positions in which they are shown in Fig, 13, which positions will occur when the elements of the inspection device are in the operative position with respect to one of the priming head assemblies, as illustrated, energization of the coil |15 will depend entirely upon whether or not one of the switches '55, 56, 5l or 58 has been closed due to defect in the priming Head assembly. If no defect is present, the circuit will remain unenergized, and if unenergized, then there will be no closing of the compound switch |13 and the terminal element |24 of the switch |23 will rem-ain unenergized. When after 180 of rotation of the cam |34 therefore the switch element 125 is brought into contact with the switch element 121i, the solenoid 103 will remain unenergized and the deilector 109 will remain in its normal position directing the said priming head when ejected into lthe chute |11. If one of the switches 55, 58, 51 or 58 is energized, then the switch 1S will be closed and the coil 115 energized. The terminal element |24 will then be energized, and in the next cycle of operations, when the inspected defective article has moved to the ejection position and the movable element |25 of the switch 123 has engaged the live terminal 124, the resulting actuation of the solenoid 103 will move the deilector |09 to a position wherein the priming head will be ejected to the reject chute 1 12.

It will be apparent that energization of the coil |15 does not result in an immediate actuation of the 'solenoid |03. Such' energization merely sets the circuit of the solenoid so that when that circuit is 4completed by a subsequent actuation of theswitch |23, which occurs just before the beginning of the next cycle, the solenoid |03 will then be energized. This delay in th'e actuation ofthe solenoid |03 is necessary in order to permit the inspected article to advance from the inspection station to the ejection station, wherein at the beginning of the next cyclic operation of the inspection device, the previously inspected priming h ead is ejected from the work-table. Each energizationfof the coil |03 is only momentary by'reason of th'e action of the cams 133 and |35 and theA associated switches. f

Thecircuit of the coil |15 remains closed in-y dependently of the switches 1 13 and 15 by reason of the holding circuit which includes the terminals |21, which circuit is completed'by the closing ofthe switchl 119 as previously described. The circuit of the coil 115 remains closed until completion of the subsequent ejection operation, and

' the circuit which contains the coil |17 now takes over the current inspection operation. After one cycle of operations which comprises a movement of the several cams from the position in which they are shown in Fig. 13, the cam |32 will have permitted the movable arm of the switch 1 14 to move downwardly intoa position to close the circuit of the coil 1 1'1. At this moment, the projection |38 of the cam |31 closes th'e switch |13 and the switch |18 will also have been closed by the cam 135. Energization of the coil 11'1 will then depend entirely upon whether or not one of the switches 55, 56, 5'1 or 58 has been closed. If none of these switches is closed and the priming h'ead under test is satisfactory, the switch |28 will remain open and the terminall element |29 of the switch 123 will remain unenergized. In the subsequent cycle, therefore, the delector |00 will remain in position overlying the chute |11. If the priming head under test is defective, the coil |11 will be energized, the switch |26 closed and the terminal element |29 energized, and in the subsequent ejecting operation, therefore, in which the priming head now under test is being rejected, the solenoid 103 will be actuated to swing the guide hood |09 to a position over the reject chute 112. It will be apparent, therefore, that simultaneously with each inspection operation, the priming head which was inspected in the previous operation will be ejected from the worktable and will be guided by the delector |09 either to the chute 11| or the chute |12, depending on whether the priming head passed inspection or not.

I claim:

1. In a gauge, opposed relatively movable gauging elements, resilient means tending to draw said elements together, electric switch' means movable bodily with one of said elements, a resilient actuator operatively associated with said switch means, and means movable with the other of said elements for controlling the operation of said actuator in accordance with the relative positions of said elements.

2. In a gauge, relatively movable gauging elements, a pair of electric switches movable bodily with one of said elements, a pivoted actuating lever common to said switches, a spring exerting resilient pressure on said lever tending to move it in a direction to actuate one of said switches, and means movable with th'e other of said elements and reactive with the lever in opposition to said spring.

3. In a gafgfe, relatively movable gauging elements, a pair of. electric'switches movable bodily with 'one 'of said elements,k a` switch-actuating lever common to both of said switches and pivotally supported on said element at a point intermediate the switches, a spring` on said element exerting resilient pressure tending torturn the lever on its pivot towards onelof said switchesl and a member movable with thev other "of said elements and reactive with' lthe `lever in opposition to said spring. l l

4, Ina. gauges Dpp'OSed 'relatively movable gallging elements, an velectric switch bodily movable with one of said elements, means including a member movable with the other of said elements for controlling 'operation of the -svvitch in accordance withth'e -relative posiitions 'of said elemerits, resilient means -`tending t0 draw 'Said elements together, means for "retracting one of said Y elements, `'and means lfor. operatively connecting the last-named 'element with the other of the elementsl whereby retraction oi the 'first-named element results automatically in 'a retraction of the other element.

Y5. Ina gauge,opposedrelatively movable gaugirg elements, Van electric switcl'l 'bodily movable with one of fsaid elements,V means including -a member movable with the other vof said elements for controlling operation "of the switch in accordance with the relative positions of 'said lements, resilient means tending 'to draw said elements together, means for retracting one of 'said elements, and lost iil'otionl means -for 'operatively connectinglthelastenamed element with the other of the elements whereby retraction of the first-named element. l'e'sults 'autorilatica'l'ly in a delayed retraction of the other "element,

u-6. vIn a `tgauge,ft-ll'e combination with a Work subpo'rt, of. "a fpair 7of relatively A'movable `gauging elements, `vit-silient :means `for urging 'one Iof said elments'intongagement with 'the support, 'resilierit meansnrging the 'other of Saidfeleinents into engagement with' Saidwikjpieca zein" electr-ic switch movable with `one of said ele ents, andv switcheactua'ting means incliding- 'a member E'on the Aother of said 'elements operative to control the bp'rationoi said "switch in )accordance with the relative Vigcsitions of'saidelSem'ents.v

'contact the head end of said priming head, a second gauging element adapted to contact the other 4end of said priming head, said elements being relatively movable, a pair of electric switches movable bodily with one ofsaid 'element-s, means includingr a member movable with the other of said elements .for operating said 'switches selectively if the said elements when irl-mutual contact lwith the said `ends of the 'priming h'e'ad ar'e abnormally close together or far apart,- a third gaugmg'element forcontact with the nring pin 'at the head end of said priming head, and means 'for -opera-'tively connecting the said third gaugin'giel'elhent with one of said electric switches whereby an vabnormal lrelative Adisfplacement' of the 'said third el-ement with respect to one of the first-named elements when Said elements 'are in Contact with the -p'riiflingfhea'd will actuat'e said switch.

8. -ln fa gauge `'for priming heads of the character set `forth, the combination with a support for said priming head, of a plurality 'of relatively movable gauging elements 'adapted respectively to contact the respective ends of the priming head, the firing 'pin vat one end 'of 'the 'priming head and -th'e work support, Aelectric switch means movable bodily with one 'of said elements, Iand means 'including Aa lm'embe'r carried byeach of the other of said 'elements for actuating the lsaid switch means if the said 'elements when 1in 'contact with 'the 'priming head fand 'with the lsilpport are abnormally Vpositioned with respect to each other.

`9. In ta `gauge iorfpriming heads 'of the character described, the combination with. a support-l for said priming head; of aigauging lelenlent'adapted to `contact the head 'end of said priming head; electric switch means movable bodily with said gaugingelement; 'a plurality 'of ladditional fgauging elements 'adapted respectively to VContact the rin'g Vloin at the head end o'f said priming Fhead, the opposite 'end 'of the priming head -vand the said support 'in 'proximity to said head end; and means including a member movable with `leach of said'additio'n'al `gauging elements `.for factuatlng the `switches if the `said elements 'when :in fcontact with the priming head fand lwith the support are abnormally cpositioned with respect to'each other.

'HOWARD THGMAS I-IAULOTVVEIZL JR; 

